Drexel dragonThe Math ForumDonate to the Math Forum

Search All of the Math Forum:

Views expressed in these public forums are not endorsed by Drexel University or The Math Forum.

Math Forum » Discussions » Software » comp.soft-sys.math.mathematica

Topic: NDSolve Encountered non-numerical value for a derivative at t=0
Replies: 0  

Advanced Search

Back to Topic List Back to Topic List  
qiu zhanlong

Posts: 1
Registered: 7/17/13
NDSolve Encountered non-numerical value for a derivative at t=0
Posted: Jul 17, 2013 1:44 AM
  Click to see the message monospaced in plain text Plain Text   Click to reply to this topic Reply

hi folks, I have one coupled equations which the NDSolve fails at t=0
t x'[t]== -x[t]+y[t],
t y'[t]== -5 t^2/x[t]^2+x[t]-y[t],
x[0]=y[0],x[1]=1,{t, 0, 1}
from the mathematica help center, there are 2 possible ways to resolve this problem, One possibility is to start at a small \[Epsilon]>0 instead of 0, the other one is Setting SolveDelayed->True will avoid the singularity in the solved form of the equations. But neither of them work for my equation.
thanks for help

Point your RSS reader here for a feed of the latest messages in this topic.

[Privacy Policy] [Terms of Use]

© Drexel University 1994-2015. All Rights Reserved.
The Math Forum is a research and educational enterprise of the Drexel University School of Education.